really unusual. but so are the results. they found reduction of 30%. if you think about statins, which so many people take for heart disease, that only reduces your risk by 25%. >> so, this diet even better than the statins. for people at home tonight, the bottom line, remind them what the diet includes. >> reporter: it's rich in fresh fruit and vegetables, whole grains, healthy proteins like fish and chicken and beans. and then you want oils that are healthy type of oils. >> you talk about healthy oils, we all think of olive oil. but we didn't know how much of it we should be consuming. >> reporter: yeah, in this study, each day, people were to consume four tablespoons of olive oil. that's a lot of oil. >> four tablespoons. how much in a month? >> reporter: two liters per month. >> two liters, a lot of oil, but you say it's healthy. and the nuts right here, always worried about gaining weight, but you say this is healthy fat. >> reporter: yeah, i mean, the fat in nuts will actually fill you up, so you will eat less in any given meal. this is what you're supposed to have every day. that's a one-month supply of nuts. >> all right, rich besser tonight, rich, our thanks to you. and as you know, one of the most outspoken surgeon generals in history has died.